Physics
What is the term for the mass per unit volume of an object, its SI units, and commonly used symbol?
Density, kg m^-3, rho (or D)
The most commonly used bleaching agent is
A) Alcohol
B) Carbon dioxide
C) Chlorine
D) Sodium chloride
C) Chlorine
Which among the following plays a role in production of alcohol in beer?
[A] Bacteria
[B] Protozoan
[C] Virus
[D] Yeast
[D] Yeast
Guess the element name, symbol and atomic number:
👠+😋
Helium, He, 2
Temperature
measure of the average kinetic energy of particles in a substance
When light enters from air to glass, what happens to its velocity (decreases, remains same, increases, or varies depending on mass of glass) and why?
decreases; because glass is an optically denser medium (higher refractive index)
Due to which of the following acids, Milk tastes sour when kept in the open for sometime?
A) Lactic Acid
B) Citric Acid
C) Acetic Acid
D) Carbonic Acid
A) Lactic Acid
Which of the following are examples of hydrophilic molecules?
[A] sugar
[B] cellulose
[C] starch
[D] all of the above
[D] all of the above
Guess the element name, symbol and atomic number:
👮+R
Copper, Cu, 29
Pauli exclusion principle
a maximum of two electrons (with opposite spins) can occupy an atomic orbital.
What will be the angular velocity of a rotating top if it travels π radians in a third of a second?
Average velocity ω=θt
The units of omega are radians per second.
Substitute the givens and solve for omega.
ω=θ/t=pi/ (1/3) = pi∗3 =3 pi
Which one of the following correctly defines the state of glass?
A) Crystalline solid
B) Super cooled liquid
C) Condensed gas
D) Liquid crystal
B) Super cooled liquid
Wilting of plants occurs due to excessive ____:
[A] Respiration
[B] Guttation
[C] Absorption
[D] Transpiration
[D] Transpiration
Guess the element name, symbol and atomic number:
G + 👴
Gold, Au, 79
Denaturation
the process by which the three-dimensional structure of an enzyme is altered, leading to the loss of its function.
The age of the universe is approximately how many years old?
a) 2 billion years
b) 20 billion years
c) 200 billion years
d) 10 billion years
d) 10 billion years
The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is
A) Carbon
B) Hydrogen
C) Nitrogen
D) Oxygen
D) Oxygen
Which of the following secretes digestive enzymes into the duodenum that break down proteins, fats, and carbohydrates?
[A] Liver
[B] Pancreas
[C] Gallbladder
[D] Small intestine
[B] Pancreas
Guess the element name, symbol and atomic number:
🇩🇪 + 😋
Germanium, Ge, 32
Principle of Superposition
When two (or more) waves meet; resultant displacement is the sum of the individual displacements;
In Doppler’s effect, the apparent frequency does not depend upon _____.
a) Speed of the source
b) Distance between the source and observer
c) Speed of the observer
d) Frequency of the source
(b)
Explanation: Apparent frequency in Doppler’s effect does not depend on the distance between observer and source. But it depends on the frequency of the source, direction and velocity of the source and observer.
The acid present in lemon is
citric acid
Which of the following enzyme is essential for clotting of blood?
[A] Renin
[B] Thrombin
[C] Amylase
[D] Pepsin
[B] Thrombin
Guess the element name, symbol and atomic number:
🐜 + E + 💵
Antimony, Sb, 51
Isomers
compounds that have the same chemical formula but a different arrangement of atoms, resulting in different physical or chemical properties.